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Microsoft Security Bulletin (MS00-063)

- --------------------------------------



Patch Available for "Invalid URL" Vulnerability

Originally posted: September 05, 2000



Summary

=======

Microsoft has released a patch that eliminates a security

vulnerability in Microsoft(r)  Internet Information Server (IIS). The

vulnerability could enable a malicious user to  prevent an affected

web server from providing useful service.



Frequently asked questions regarding this vulnerability and the patch

can be found at

http://www.microsoft.com/technet/security/bulletin/fq00-063.asp



Issue

=====

If an affected web server received a particular type of invalid URL,

it could, under certain  conditions, start a chain of events that

would culminate in an invalid memory request that would cause the IIS

service to fail. This would prevent the server from providing web

services.



This vulnerability does not provide the opportunity to compromise any

data on the server or to usurp any administrative privileges on the

server. An affected machine could be put back into service by

restarting the IIS service.



Although the effect of the vulnerability manifests itself through

IIS, the underlying  problem actually lies within Windows NT 4.0.

Microsoft engineers worked extensively to  identify scenarios for

exploiting the vulnerability directly through Windows NT 4.0, but did

not find any - the only scenarios identified to date involve IIS.

Nevertheless, it is  possible that scenarios for exploiting the

vulnerability through Windows NT 4.0 do exist,  and as a result, we

recommend that customers using Windows NT 4.0 consider applying the

patch.



Affected Software Versions

==========================

 - Microsoft Internet Information Server 4.0



Note: As noted above in "Issue", the root cause of this vulnerability

lies in Windows NT  4.0, and Microsoft recommends that customers

using Windows NT 4.0 consider applying the  patch.



Patch Availability

==================

 - Microsoft Windows NT 4.0 Workstation, Server and Server,

   Enterprise Edition:

   http://www.microsoft.com/Downloads/Release.asp?ReleaseID=24079

 - Microsoft Windows NT 4.0 Server, Terminal Server Edition: To be

   released shortly



Note Additional security patches are available at the Microsoft

Download Center



More Information

================

Please see the following references for more information related to

this issue.

 - Frequently Asked Questions: Microsoft Security Bulletin MS00-063,

   http://www.microsoft.com/technet/security/bulletin/fq00-063.asp

 - Microsoft Knowledge Base article Q271652 discusses this issue

   and will be available soon.

 - Microsoft TechNet Security web site,

   http://www.microsoft.com/technet/security/default.asp



Obtaining Support on this Issue

===============================

This is a fully supported patch. Information on contacting Microsoft

Product Support  Services is available at

http://support.microsoft.com/support/contact/default.asp.



Acknowledgments

===============

Microsoft thanks Peter Grundl of VIGILANTe (http://www.vigilante.com)

for reporting this  issue to us and working with us to protect

customers.



Revisions

=========

 - September 05, 2000: Bulletin Created.



- -------------------------------------------------------------



THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED

"AS IS" WITHOUT  WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL

WARRANTIES, EITHER EXPRESS OR IMPLIED,  INCLUDING THE WARRANTIES OF

MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO  EVENT

SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY

DAMAGES WHATSOEVER  INCLUDING DIRECT, INDIRECT, INCIDENTAL,

CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL  DAMAGES, EVEN IF

MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE

POSSIBILITY  OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION

OR LIMITATION OF LIABILITY FOR  CONSEQUENTIAL OR INCIDENTAL DAMAGES

SO THE FOREGOING LIMITATION MAY NOT APPLY.

Last Updated September 05, 2000

(c) 2000 Microsoft Corporation. All rights reserved. Terms of use.



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